Global Patent Index - EP 1710792 A3

EP 1710792 A3 2009-02-18 - Servo-balance adjusting technique for optical disk recording

Title (en)

Servo-balance adjusting technique for optical disk recording

Title (de)

Optisches Plattenaufzeichnungsverfahren mit Funktion zur Bildung von genau auf die Spur zentrierten Pits und Verfahren zur Einstellung des Servoausgleichs zur optischen Plattenaufzeichnung

Title (fr)

Technique d'enregistrement du disque optique capable de former des trous précisément centrés sur la technique d'adaptation de la piste et de la servo-balance pour l'enregistrement du disque optique

Publication

EP 1710792 A3 (EN)

Application

EP 06012735 A

Priority

  • EP 99103017 A
  • JP 4875698 A
  • JP 19968898 A

Abstract (en)

[origin: EP0936602A2] In recording on an optical disk, tracking control is performed using tracking error signals detected during an OFF period and a rear time segment within an ON period of a recording pulse signal. The time segment for detecting the tracking error signal within the recording pulse ON period is variably controlled in accordance with recording conditions such as a disk type and recording speed. This control can effectively prevent a tendency of pits being formed off the center line of a track toward the inner circumference of the optical disk due to the influence of residual heat from an adjoining inner track, thereby allowing pits to be formed accurately on and along the track center line. Further, during recording, a detection is made of a wobble-corresponding component contained in an HF signal corresponding to reflections of a recording light beam from the optical disk, and servo-balance adjusting variable resistors are adjusted on the basis of the detected wobble-corresponding component in such a way that the detected component presents its minimum level. <IMAGE>

IPC 8 full level (invention and additional information)

G11B 7/09 (2006.01); G11B 7/00 (2006.01); G11B 7/0037 (2006.01); G11B 7/0045 (2006.01)

CPC (invention and additional information)

G11B 7/0908 (2013.01); G11B 7/0901 (2013.01); G11B 7/094 (2013.01); G11B 7/0945 (2013.01); G11B 7/0037 (2013.01); G11B 7/0045 (2013.01)

Citation (search report)

  • [Y] EP 0270118 A2 19880608 - FUJITSU LTD [JP]
  • [XY] PATENT ABSTRACTS OF JAPAN vol. 1995, no. 11 26 December 1995 (1995-12-26)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 017, no. 550 (P - 1624) 4 October 1993 (1993-10-04)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

Designated extension state (EPC)

AL LT LV MK RO SI

DOCDB simple family

EP 0936602 A2 19990818; EP 0936602 A3 20020220; EP 0936602 B1 20060920; DE 69933251 D1 20061102; DE 69933251 T2 20070516; EP 1710792 A2 20061011; EP 1710792 A3 20090218; EP 1710792 B1 20130410; US 2001010667 A1 20010802; US 6643239 B2 20031104